6647601643 has 2 divisors, whose sum is σ = 6647601644. Its totient is φ = 6647601642.

The previous prime is 6647601619. The next prime is 6647601659. The reversal of 6647601643 is 3461067466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6647601643 - 2⁹ = 6647601131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6647601643.

It is not a weakly prime, because it can be changed into another prime (6647601683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323800821 + 3323800822.

It is an arithmetic number, because the mean of its divisors is an integer number (3323800822).

Almost surely, 2^6647601643 is an apocalyptic number.

6647601643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647601643 is an equidigital number, since it uses as much as digits as its factorization.

6647601643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 6647601643 is about 81532.8255551100. The cubic root of 6647601643 is about 1880.2762574076.

The spelling of 6647601643 in words is "six billion, six hundred forty-seven million, six hundred one thousand, six hundred forty-three".